drivers/hid/intel-ish-hid/ipc/pci-ish.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * PCI glue for ISHTP provider device (ISH) driver
   4  *
   5  * Copyright (c) 2014-2016, Intel Corporation.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/moduleparam.h>
  10 #include <linux/kernel.h>
  11 #include <linux/device.h>
  12 #include <linux/fs.h>
  13 #include <linux/errno.h>
  14 #include <linux/types.h>
  15 #include <linux/pci.h>
  16 #include <linux/sched.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/workqueue.h>
  19 #define CREATE_TRACE_POINTS
  20 #include <trace/events/intel_ish.h>
  21 #include "ishtp-dev.h"
  22 #include "hw-ish.h"
  23
  24 static const struct pci_device_id ish_pci_tbl[] = {
  25         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CHV_DEVICE_ID)},
  26         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Ax_DEVICE_ID)},
  27         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Bx_DEVICE_ID)},
  28         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, APL_Ax_DEVICE_ID)},
  29         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_Ax_DEVICE_ID)},
  30         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_Ax_DEVICE_ID)},
  31         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, GLK_Ax_DEVICE_ID)},
  32         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CNL_H_DEVICE_ID)},
  33         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, ICL_MOBILE_DEVICE_ID)},
  34         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_H_DEVICE_ID)},
  35         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CML_LP_DEVICE_ID)},
  36         {0, }
  37 };
  38 MODULE_DEVICE_TABLE(pci, ish_pci_tbl);
  39
  40 /**
  41  * ish_event_tracer() - Callback function to dump trace messages
  42  * @dev:        ishtp device
  43  * @format:     printf style format
  44  *
  45  * Callback to direct log messages to Linux trace buffers
  46  */
  47 static __printf(2, 3)
  48 void ish_event_tracer(struct ishtp_device *dev, const char *format, ...)
  49 {
  50         if (trace_ishtp_dump_enabled()) {
  51                 va_list args;
  52                 char tmp_buf[100];
  53
  54                 va_start(args, format);
  55                 vsnprintf(tmp_buf, sizeof(tmp_buf), format, args);
  56                 va_end(args);
  57
  58                 trace_ishtp_dump(tmp_buf);
  59         }
  60 }
  61
  62 /**
  63  * ish_init() - Init function
  64  * @dev:        ishtp device
  65  *
  66  * This function initialize wait queues for suspend/resume and call
  67  * calls hadware initialization function. This will initiate
  68  * startup sequence
  69  *
  70  * Return: 0 for success or error code for failure
  71  */
  72 static int ish_init(struct ishtp_device *dev)
  73 {
  74         int ret;
  75
  76         /* Set the state of ISH HW to start */
  77         ret = ish_hw_start(dev);
  78         if (ret) {
  79                 dev_err(dev->devc, "ISH: hw start failed.\n");
  80                 return ret;
  81         }
  82
  83         /* Start the inter process communication to ISH processor */
  84         ret = ishtp_start(dev);
  85         if (ret) {
  86                 dev_err(dev->devc, "ISHTP: Protocol init failed.\n");
  87                 return ret;
  88         }
  89
  90         return 0;
  91 }
  92
  93 static const struct pci_device_id ish_invalid_pci_ids[] = {
  94         /* Mehlow platform special pci ids */
  95         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xA309)},
  96         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0xA30A)},
  97         {}
  98 };
  99
 100 /**
 101  * ish_probe() - PCI driver probe callback
 102  * @pdev:       pci device
 103  * @ent:        pci device id
 104  *
 105  * Initialize PCI function, setup interrupt and call for ISH initialization
 106  *
 107  * Return: 0 for success or error code for failure
 108  */
 109 static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 110 {
 111         int ret;
 112         struct ish_hw *hw;
 113         unsigned long irq_flag = 0;
 114         struct ishtp_device *ishtp;
 115         struct device *dev = &pdev->dev;
 116
 117         /* Check for invalid platforms for ISH support */
 118         if (pci_dev_present(ish_invalid_pci_ids))
 119                 return -ENODEV;
 120
 121         /* enable pci dev */
 122         ret = pcim_enable_device(pdev);
 123         if (ret) {
 124                 dev_err(dev, "ISH: Failed to enable PCI device\n");
 125                 return ret;
 126         }
 127
 128         /* set PCI host mastering */
 129         pci_set_master(pdev);
 130
 131         /* pci request regions for ISH driver */
 132         ret = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
 133         if (ret) {
 134                 dev_err(dev, "ISH: Failed to get PCI regions\n");
 135                 return ret;
 136         }
 137
 138         /* allocates and initializes the ISH dev structure */
 139         ishtp = ish_dev_init(pdev);
 140         if (!ishtp) {
 141                 ret = -ENOMEM;
 142                 return ret;
 143         }
 144         hw = to_ish_hw(ishtp);
 145         ishtp->print_log = ish_event_tracer;
 146
 147         /* mapping IO device memory */
 148         hw->mem_addr = pcim_iomap_table(pdev)[0];
 149         ishtp->pdev = pdev;
 150         pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
 151
 152         /* request and enable interrupt */
 153         ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
 154         if (!pdev->msi_enabled && !pdev->msix_enabled)
 155                 irq_flag = IRQF_SHARED;
 156
 157         ret = devm_request_irq(dev, pdev->irq, ish_irq_handler,
 158                                irq_flag, KBUILD_MODNAME, ishtp);
 159         if (ret) {
 160                 dev_err(dev, "ISH: request IRQ %d failed\n", pdev->irq);
 161                 return ret;
 162         }
 163
 164         dev_set_drvdata(ishtp->devc, ishtp);
 165
 166         init_waitqueue_head(&ishtp->suspend_wait);
 167         init_waitqueue_head(&ishtp->resume_wait);
 168
 169         ret = ish_init(ishtp);
 170         if (ret)
 171                 return ret;
 172
 173         return 0;
 174 }
 175
 176 /**
 177  * ish_remove() - PCI driver remove callback
 178  * @pdev:       pci device
 179  *
 180  * This function does cleanup of ISH on pci remove callback
 181  */
 182 static void ish_remove(struct pci_dev *pdev)
 183 {
 184         struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);
 185
 186         ishtp_bus_remove_all_clients(ishtp_dev, false);
 187         ish_device_disable(ishtp_dev);
 188 }
 189
 190 static struct device __maybe_unused *ish_resume_device;
 191
 192 /* 50ms to get resume response */
 193 #define WAIT_FOR_RESUME_ACK_MS          50
 194
 195 /**
 196  * ish_resume_handler() - Work function to complete resume
 197  * @work:       work struct
 198  *
 199  * The resume work function to complete resume function asynchronously.
 200  * There are two resume paths, one where ISH is not powered off,
 201  * in that case a simple resume message is enough, others we need
 202  * a reset sequence.
 203  */
 204 static void __maybe_unused ish_resume_handler(struct work_struct *work)
 205 {
 206         struct pci_dev *pdev = to_pci_dev(ish_resume_device);
 207         struct ishtp_device *dev = pci_get_drvdata(pdev);
 208         uint32_t fwsts;
 209         int ret;
 210
 211         /* Get ISH FW status */
 212         fwsts = IPC_GET_ISH_FWSTS(dev->ops->get_fw_status(dev));
 213
 214         /*
 215          * If currently, in ISH FW, sensor app is loaded or beyond that,
 216          * it means ISH isn't powered off, in this case, send a resume message.
 217          */
 218         if (fwsts >= FWSTS_SENSOR_APP_LOADED) {
 219                 ishtp_send_resume(dev);
 220
 221                 /* Waiting to get resume response */
 222                 if (dev->resume_flag)
 223                         ret = wait_event_interruptible_timeout(dev->resume_wait,
 224                                 !dev->resume_flag,
 225                                 msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS));
 226         }
 227
 228         /*
 229          * If in ISH FW, sensor app isn't loaded yet, or no resume response.
 230          * That means this platform is not S0ix compatible, or something is
 231          * wrong with ISH FW. So on resume, full reboot of ISH processor will
 232          * happen, so need to go through init sequence again.
 233          */
 234         if (dev->resume_flag)
 235                 ish_init(dev);
 236 }
 237
 238 /**
 239  * ish_suspend() - ISH suspend callback
 240  * @device:     device pointer
 241  *
 242  * ISH suspend callback
 243  *
 244  * Return: 0 to the pm core
 245  */
 246 static int __maybe_unused ish_suspend(struct device *device)
 247 {
 248         struct pci_dev *pdev = to_pci_dev(device);
 249         struct ishtp_device *dev = pci_get_drvdata(pdev);
 250
 251         enable_irq_wake(pdev->irq);
 252         /*
 253          * If previous suspend hasn't been asnwered then ISH is likely dead,
 254          * don't attempt nested notification
 255          */
 256         if (dev->suspend_flag)
 257                 return  0;
 258
 259         dev->resume_flag = 0;
 260         dev->suspend_flag = 1;
 261         ishtp_send_suspend(dev);
 262
 263         /* 25 ms should be enough for live ISH to flush all IPC buf */
 264         if (dev->suspend_flag)
 265                 wait_event_interruptible_timeout(dev->suspend_wait,
 266                                                  !dev->suspend_flag,
 267                                                   msecs_to_jiffies(25));
 268
 269         return 0;
 270 }
 271
 272 static __maybe_unused DECLARE_WORK(resume_work, ish_resume_handler);
 273 /**
 274  * ish_resume() - ISH resume callback
 275  * @device:     device pointer
 276  *
 277  * ISH resume callback
 278  *
 279  * Return: 0 to the pm core
 280  */
 281 static int __maybe_unused ish_resume(struct device *device)
 282 {
 283         struct pci_dev *pdev = to_pci_dev(device);
 284         struct ishtp_device *dev = pci_get_drvdata(pdev);
 285
 286         ish_resume_device = device;
 287         dev->resume_flag = 1;
 288
 289         disable_irq_wake(pdev->irq);
 290         schedule_work(&resume_work);
 291
 292         return 0;
 293 }
 294
 295 static SIMPLE_DEV_PM_OPS(ish_pm_ops, ish_suspend, ish_resume);
 296
 297 static struct pci_driver ish_driver = {
 298         .name = KBUILD_MODNAME,
 299         .id_table = ish_pci_tbl,
 300         .probe = ish_probe,
 301         .remove = ish_remove,
 302         .driver.pm = &ish_pm_ops,
 303 };
 304
 305 module_pci_driver(ish_driver);
 306
 307 /* Original author */
 308 MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
 309 /* Adoption to upstream Linux kernel */
 310 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 311
 312 MODULE_DESCRIPTION("Intel(R) Integrated Sensor Hub PCI Device Driver");
 313 MODULE_LICENSE("GPL");